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A CRACK CLOSURE STUDY TO PREDICT THE THRESHOLD BEHAVIOUR OF SMALL CRACKS
Fatigue & Fracture of Engineering Materials & Structures, 1989Abstract— The small crack problem is addressed within the applicability of Linear Elastic Fracture Mechanics as the result of crack closure phenomenon. The variation of crack closure stress intensity factory Kop as a function of crack length, a, was determined in two materials, namely a A508 steel and a 2024A1 alloy.
B. G. Journet, A. Lefrancois, A. Pineau
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Transition from Small Crack to Large Crack on Creep-Fatigue Crack Propagation
1992Experiments of creep fatigue crack propagation on a Type 304 stainless steel indicated that there appeared two regimes called “the microstructurally small crack” and “the mechanically large crack” before and after the transient regime from about 100 μm (twice mean grain diameter or four grain boundary lengths) to 500 μm.
Ryuichi Ohtani +3 more
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The influence of crack tip plasticity in the growth of small fatigue cracks
Metallurgical Transactions A, 1984In order to rationalize observed differences in the growth behavior of large and small cracks, local crack tip opening micromechanics have been characterized for both crack size regimes in a high strength aluminum alloy. It is found that crack tip opening displacement, crack tip opening load, and crack opening mode all differ widely for large and small
James Lankford +2 more
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On a model of small fatigue cracks
Engineering Fracture Mechanics, 1987Abstract A simple model is proposed, which allows one to explain and describe quantitatively the peculiarities of the kinetics of small fatigue cracks growth. The characteristics of material microstructure are introduced into consideration explicitly as well as those of the fields of microstress induced by the material microstructure.
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Crack closure: An explanation for small fatigue crack growth behavior
Engineering Fracture Mechanics, 1985Abstract The deceleration and/or acceleration of small fatigue crack growth rates with increasing stress intensity range, ΔK, can be explained by crack closure. Crack closure additionally appears to offer an explanation as to why some small cracks reach a point at which they cease to propagate.
P.K. Liaw, W.A. Logsdon
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Multiaxial mixed-mode cracking – small crack initiation and propagation*
Materials Testing, 2006Abstract Both the fatigue crack path and fatigue life of CK45 steel and 42CrMo4 steel under various multiaxial loading paths are studied in this paper. The replica method was applied to monitor the crack initiation and small crack growth, the fractographic analyses were carried out on the fracture surface and the crack initiation angle ...
Manuel de Freitas, Luis Reis, Bin Li
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Experimental Study on Fatigue Crack Closure of Small Cracks at Notches
1991Fatigue crack closure of small cracks was studied experimentally using double—edge—notched Ly12cz Al alloy plate specimens.The crack initiation and growth were observed by a metallurgical microscope. Once a small corner crack was formed, a pair of tiny indentations 50µm apart were made at opposite blanks of the crack and were used as the bench mark for
Y. Q. He, Z. N. Li, C. H. Kou, Q. Z. He
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Growth and behaviour of small cracks
1997It has been pointed out in sections 7.6 and 8.4.1 that small cracks behave differently from their long counterparts. The similitude concept of fracture mechanics, i.e. that cracks with the same crack tip condition (e.g. ΔK) will propagate at the same rate, does not hold for a physically short crack.
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